Ultrasound‐defined adenomyosis subtypes and their impact on outcomes following frozen embryo transfer: a propensity score‐matched cohort study

Adenomyosis, particularly internal and mixed-type, is associated with a reduced live-birth rate and an increased risk of early pregnancy loss in those achieving clinical pregnancy following FET. Ultrasound-based phenotyping of adenomyosis prior to FET may support individualized assisted reproductive technology management. Further prospective studies are needed to validate these results. © 2025 International Society of Ultrasound in Obstetrics and Gynecology.